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Initial Plumbing set-up: Loft: Cold water tank with 1x 22mm feed to HWC, and tee-ing off this 22mm just after it leaves the tank is a 15mm HEP feed down to the Cold side of the shower pump under the bath on ground floor. (there are no other Cold feed off the tanks as all the cold taps are mains...

I installed a Worcester Bosch 18RI to an existing open vent system but there is really bad circulation. some rads ok to Luke warm and a couple still cold. I have been back 3x to bleed air out of the system. 2 rads particularly bad. Air still rattling past pump (located in basement) and...

System: I have a sealed s-plan system with boiler in loft, Grundfos 25-50 Pump + unvented cylinder in cupboard in top floor, 22mm pipework supplying 5 towel rails & about 13 traditional style rads all with TRVs. Problem: The system was heated with an underspec'd Worcester 18KW Ri, but this...